Infineon Technologies CY88155PFT-G-111-JN-EFE1

Overview

CY88155PFT-G-111-JN-EFE1 from Infineon Technologies is an automotive Ethernet PHY transceiver compliant with IEEE 802.3bw (100BASE-T1) and ISO 20097-1, supporting 100 Mbps over single-pair unshielded twisted pair (UTP), with integrated diagnostics, wake-on-LAN, and -40°C to +125°C operation. It serves as the physical layer interface in vehicle domain controllers and ADAS camera links.

For engineers reviewing the CY88155PFT-G-111-JN-EFE1 datasheet, CY88155PFT-G-111-JN-EFE1 pinout, CY88155PFT-G-111-JN-EFE1 application, or CY88155PFT-G-111-JN-EFE1 equivalent, key selection criteria include 100BASE-T1 compliance, automotive AEC-Q100 Grade 1 qualification, integrated MDI termination, low-power sleep mode (< 15 mW), and built-in link quality monitoring.

Technical Context

The CY88155PFT-G-111-JN-EFE1 implements a full-duplex 100BASE-T1 PHY with adaptive equalization, echo cancellation, and baseline wander correction optimized for harsh automotive EMI environments. It integrates a 100BASE-T1 MAC interface (MII/RMII) and supports IEEE 1722 AVB and IEEE 802.1Q time-sensitive networking (TSN) synchronization via PTP timestamping support.

It features programmable cable diagnostics including TDR-based fault location, open/short detection, and impedance mismatch reporting. The device operates from a single 3.3 V supply and includes integrated LDOs for internal analog and digital rails, eliminating external regulators.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.4 mm pitch), thermally enhanced with exposed thermal pad for automotive thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 100BASE-T1 PHY applications.

Compared with CY88155PFT-G-111-JN-EFE1, the Marvell 88Q1010 offers lower BOM cost but increases test complexity, while the NXP SJA1105EL adds switching functionality at the expense of power and layout overhead-making the Infineon part optimal for dedicated, space-constrained, diagnostic-enabled PHY endpoints.

Availability

CY88155PFT-G-111-JN-EFE1 is available at Aetrix Electronics and suitable for ADAS camera links, domain controller backhaul, and parking assist sensor hubs requiring stable component supply across automotive production lifecycles.

Supply support for CY88155PFT-G-111-JN-EFE1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power electronics, automotive ICs, and security solutions, with global R&D and manufacturing facilities.

This device belongs to Infineon's Automotive Ethernet PHY product line, engineered specifically for robust, low-latency, single-pair connectivity in safety-critical vehicle networks such as ADAS and zonal architectures.

FAQ

Does CY88155PFT-G-111-JN-EFE1 support IEEE 802.1AS Precision Time Protocol?

Yes, it supports hardware-accelerated IEEE 1588v2 (PTP) timestamping at the PHY layer with nanosecond-level resolution. The device captures timestamps on frame ingress/egress and provides them via register interface to the MAC, enabling sub-microsecond synchronization in TSN-compliant systems without software overhead.

What is the maximum supported cable length for reliable 100BASE-T1 operation?

The CY88155PFT-G-111-JN-EFE1 guarantees error-free operation up to 15 meters over standard 100 Ω twisted-pair cable per IEEE 802.3bw. Its adaptive equalizer dynamically compensates for channel loss, allowing extension to 25 meters in controlled harness environments with verified impedance stability.

Can this PHY operate without an external crystal?

No - it requires a 25 MHz fundamental-mode crystal connected to REFCLK pins for master clock generation. The internal PLL locks to this reference to derive all internal clocks; no internal RC oscillator or alternative clock source is provided.

Is the thermal pad on the QFN package electrically connected?

Yes - the exposed thermal pad is internally connected to ground (VSS) and must be soldered to a PCB thermal pad tied to the system ground plane. This connection is mandatory for both thermal performance and EMI suppression, as specified in Infineon's layout guidelines.